<!DOCTYPE HTML><html><head>    <title></title>    <meta charset="UTF-8">    <script src="node_modules/babel-core/browser.js"></script>    <!--    text/babel  ES6的规范，es6，默认遵循严格模式。，不需要手动添加 "ues strict"    -->    <script type="text/babel">//        (function () {//            var uname="周杰伦";//        })()////        console.log(uname);//{//    let uname="周杰伦";//    console.log(uname);//}                for(let i=0;i<10;i++){                  }console.log(i);// 泄露    </script></head><body></body></html>